<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- alert提示文本区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        center
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- form表单存储tabs的值 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!-- tabs标签页 -->
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{
                  expandTrigger: 'hover',
                  value: 'cat_id',
                  label: 'cat_name',
                  children: 'children',
                }"
                @change="handleCateChanged"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 上传action为要上传的地址这里指定的是上传图片 -->
            <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="addBtn" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="请选择合法图片" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash';

export default {
  data() {
    return {
      //控制步骤条和tabs标签页同步
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所处的分类数组级联选择器绑定的值现在是个数组但发起请求要求是以逗号分隔的字符串
        goods_cat: [],
        //图片上传成功后保存的临时路径
        pics: [],
        //商品的详情描述
        goods_introduce: '',
        //给克隆者用
        attrs: [],
      },
      //表单验证规则
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品名称',
            trigger: 'blur',
          },
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur',
          },
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur',
          },
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur',
          },
        ],
        //上面都是表单数据的验证规则下面是级联选择器的
        goods_cat: [
          {
            required: true,
            message: '请选择商品分类',
            trigger: 'blur',
          },
        ],
      },
      //商品列表数据
      cateList: [],
      //动态参数数据
      manyTableData: [],
      //静态属性数据
      onlyTableData: [],
      //获取并保存token因为上传文件没有使用axios所以要自己手动拿
      headersObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      previewPath: '',
      previewVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品列表数据
    async getCateList() {
      const { data: response } = await this.$http.get('categories');
      if (response.meta.status !== 200)
        return this.$message({
          message: response.meta.msg,
          type: 'error',
          center: true,
        });
      this.cateList = response.data;
    },
    //当级联选择器发生变化执行
    handleCateChanged() {
      if (this.addForm.goods_cat.length !== 3)
        return (this.addForm.goods_cat = []);
    },
    //tabs标签页的钩子函数在切换前触发
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message({
          message: '请先完成此页',
          type: 'error',
          center: true,
        });
        return false;
      }
      return true;
    },
    //当tabs被点击时执行的和钩子有点类似但不会阻止
    async tabClicked() {
      if (this.activeIndex === '1') {
        const { data: response } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' },
          }
        );
        if (response.meta.status !== 200)
          return this.$message({
            message: response.meta.msg,
            type: 'error',
            center: true,
          });
        response.data.forEach(
          (item) =>
            (item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(' '))
        );
        this.manyTableData = response.data;
      } else if (this.activeIndex === '2') {
        const { data: response } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' },
          }
        );
        if (response.meta.status !== 200)
          return this.$message({
            message: response.meta.msg,
            type: 'error',
            center: true,
          });
        this.onlyTableData = response.data;
      }
    },
    //处理上传图片的预览(图片被点击触发)
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    //当点击要移除预上传图片时执行
    handleRemove(file) {
      const filePath = file.response.data.tmp_path;
      const index = this.addForm.pics.findIndex((x) => x.pic === filePath);
      this.addForm.pics.splice(index, 1);
    },
    //监听图片上传成功的钩子函数
    handleSuccess(response) {
      const picInfo = {
        pic: response.data.tmp_path,
      };
      this.addForm.pics.push(picInfo);
    },
    //监听添加按钮
    add() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid)
          return this.$message({
            message: '请填写必要的表单项！',
            type: 'error',
            center: true,
          });
        /* 因为请求参数需要的是字符串形式的cat而联级选择器要的是数组他们又共用同一个数据
        所以现在要进行深拷贝这里深拷贝是使用了第三方的lib产生一个一样的数据但不会互相影响 */
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(',');
        //处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' '),
          };
          this.addForm.attrs.push(newInfo);
        });
        //处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          };
          this.addForm.attrs.push(newInfo);
        });
        //最后赋值给克隆者
        form.attrs = this.addForm.attrs;
        //发起请求
        const { data: response } = await this.$http.post('goods', form);
        if (response.meta.status !== 201)
          return this.$message({
            message: response.meta.msg,
            type: 'error',
            center: true,
          });
        this.$message({
          message: response.meta.msg,
          type: 'success',
          center: true,
        });
        this.$router.push('/goods')
      });
    },
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) return this.addForm.goods_cat[2];
      return null;
    },
  },
};
</script>

<style scoped>
.el-checkbox {
  margin: 0 8px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.addBtn {
  float: right;
  margin-top: 15px;
}
</style>